工程因素对施工期地下洞室围岩质量影响分析

Impact of Engineering Factors on Surrounding Rock Quality of Underground Caverns During Construction

地下工程规模扩大化和布置形式复杂化,以及人为改造因素对围岩质量影响日益显著,因此,准确评价工程岩体质量,需考虑自然因素和工程因素的综合影响。其中工程因素应作为自然因素围岩质量体系的修正条件予以考虑。以大岗山水电站地下厂房区为例,尝试分析施工期工程因素对围岩质量的影响,首先归纳了工程因素主要类型及其对围岩质量的影响,藉此选取针对性的评价指标对围岩质量予以劣化效应定量化表示及工程时效性、功能性与支护补强的关联分析;此后,基于相关技术要求,提出了施工期分层次、围岩分类体系构建流程,为实现工程因素劣化作用的定量表示及其在施工期围岩评价体系中的作用提供了理论基础。对工程因素与围岩质量评价体系的影响作用等研究具有一定启迪意义。

The impact of human activity on surrounding rock quality is increasingly remarkable because of largescale and complicated arrangement of underground projects. In order to accurately evaluate engineering rock quali- ty, both the natural impact factors and the engineering factors need to be considered, and the engineering factors should be regarded as the modification indexes of natural factors during the evaluation. With Dagangshan hydropow- er station as an example, the main engineering factors and their impacts on surrounding rock quality are summa- rized. On this basis, some targeted factors are chosen to quantitatively describe the quality degradation effect and to analyze the correlation of supports. Furthermore, according to some technical requirements of the surrounding rock classification systems, the flow chart of multi-level surrounding rock evaluation system in construction period is put forward. This research provides theoretical foundation for the quantitative expression of degradation caused by engineering factors and the evaluation system for surrounding rock quality. It also has enlightening significance for the research on the impact of engineering factor on surrounding rocks evaluation system.